Fix activation of disks with auto discovery
Fix activation of disks with auto discovery

With osd_auto_discovery enabled, the 'devices' list isn't
meaningful. We should activate ansible_devices instead.

travmi/ceph-ansible,guits/ceph-ansible,guits/ceph-ansible,fgal/ceph-ansible,travmi/ceph-ansible,albertomurillo/ceph-ansible,ceph/ceph-ansible,WingkaiHo/ceph-ansible,jfcoz/ceph-ansible,PiotrProkop/ceph-ansible,verdurin/ceph-ansible-1,albertomurillo/ceph-ansible,mcsage/ceph-ansible,font/ceph-ansible,rootfs/ceph-ansible,jtaleric/ceph-ansible,jsaintrocc/ceph-ansible,jtaleric/ceph-ansible,PiotrProkop/ceph-ansible,dang/ceph-ansible,lejonet/ansible-ceph-common,verdurin/ceph-ansible-1,jsaintrocc/ceph-ansible,fgal/ceph-ansible,jfcoz/ceph-ansible,font/ceph-ansible,albertomurillo/ceph-ansible,bengland2/ceph-ansible,dang/ceph-ansible,ceph/ceph-ansible,rootfs/ceph-ansible,mcsage/ceph-ansible,WingkaiHo/ceph-ansible,WingkaiHo/ceph-ansible,bengland2/ceph-ansible